3. Patients with evidence of active systemic infection. Patients with active systemic infection could have various antibodies in the serum, and some of these could cross-react with bevacizumab or ranibizumab. This would give the false impression that these patients have developed neutralizing antibodies against bevacizumab or ranibizumab, when in fact these cross-reactive antibodies were present in the patient secondary to the presence of active systemic infection and are not related to bevacizumab or ranibizumab.